Answer this question truthfully
### Question: What are the causes of Multiple sclerosis ?
### Response: MS is caused by damage to the myelin sheath. This sheath is the protective covering that surrounds nerve cells. When this nerve covering is damaged, nerve signals slow or stop. The nerve damage is caused by inflammation. Inflammation occurs when the body's own immune cells attack the nervous system. This can occur in any area of the brain, optic nerve, and spinal cord.
It is unknown what exactly causes MS. The most common thought is that a virus or gene defect, or both, are to blame. Environmental factors may also play a role.
You are slightly more likely to develop this condition if you have a family history of MS or you live in a part of the world where MS is more common.